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MicroRAM Rev 1.2 has problems with IBM PC 5150 / 5160. Up to Rev 1.1 worked fine, but Rev 1.2 caused problems. And DOS 5 means MS-DOS 5.0, right? DOS Shell for IBM PC DOS needs 384KB of RAM

>>Next one up (0156214?): This seems to have problem on BASIC ROM. Except this, it seems to be ok. BIOS seems to be Rev.1 (10/19/1981) if not updated to Rev.2

I don't know what the heck happened, but honestly, it was unexpected. Even though the seller clearly stated it as Non Working At first, I was bidding at a high price, but then it ended like that. There are obviously many doubts.

Another IBM PC 5150 (Rev.A) with early S/N (0102562) is selling on eBay. https://www.ebay.com/itm/165806137148

If that's such an easy conclusion, there's no reason to post here on the forum. Rev 1.2 was not purchased 2 at the same time, but was purchased 1 at a cycle of almost 1 month, and unfortunately, the same symptoms were found, but it is not a problem that can be solved by simply replacing it. It...

Honestly, it is unexpected that MicroRAM Rev 1.2 crashes or freezes irregularly not only in XT-IDE, but also in Area 5150. Even the 5150 Rev.A (16KB-64KB, Rev.0 04/24/81) motherboard I have is cumbersome, but after a temporary replacement with Rev.2 10/27/82 BIOS for testing, SW2's RAM I need to...

Area 5150 to run on 3.5" 720KB diskette After running IBM DOS 3.20, the files were sequentially copied to a diskette and then dumped to a disk image. Rather than making it like some people like WINIMAGE, I made it to fit the practical skills even if it takes a little more time to enjoy the taste...

After installing MicroRAM Rev 1.2 to IBM PC 5150 or XT 5160, when Area 5150 is executed, it crashes irregularly in the middle. My guess is that the issue is specific to MicroRAM Rev 1.2 and Rev. In 1.0 and 1.1, there is no crashing problem with Area 5150 at all. Please refer to those using...

Personally, I appreciate the Area5150 for maximizing its 8088 CPU and IBM CGA. However, if you are very disappointed, RAM: 512KB instead of 640KB Should have made it run on all IBM PC 5150 / 5160 / 5170 Nevertheless, the system requirements that must be met unconditionally for RAM: 640KB This...

I would like to apologize to you all. I found the exact cause. As it turns out, there was a problem with the -5V supply terminal in the AT type power supply, and the ATX power supply had a problem with the -5V voltage not being properly supplied. occurred. It worked fine until a few days ago...

For reference, to describe the exact symptoms: Once recognized by FDC (P/N: 1809113), The problem is that after the boot control is transferred to the FDC, it cannot be booted from there. Not only that, but even if you do DIR A: after booting from the hard disk "Not ready reading drive A:"...

I'm just stating what I tested as is. You are free to believe or not, but don't ask me for the results because you're curious, but directly, IBM PC 5160 main board + FDC (P/N: 1809113) + XT/AT power supply, XT supported keyboard + FDD Buy it and test it out. To be clear, I am telling the...

Even if -5V power is supplied or not, the result is not operated in the same way. (Even if I use AT power or AT->ATX converter that can supply -5V power to me Same.) As you know, the -5V power supply is needed not only for the ISA bus, but also for the 4116 RAM chip of the IBM PC 5150 Rev.A...

https://www.minuszerodegrees.net/5150/early/5150_compare_diskette_adapter.htm I have 2ea of early version of IBM 5.25" Diskette Drive Adapter (P/N : 1809113 XM) in 1981. This supports 5.25" 360KB (fully), 3.5" 70KB (partially, needed driver for full working.) But this is for IBM PC 5150 only...

Well, I recommend to discuss on Latees PC thread. This thread is for old PC (8088/80286) not for 386 / 486. https://forum.vcfed.org/index.php?forums/later-pcs.66/

>>So, this exact system just popped back on eBay for considerably more than it sold for just 2 weeks ago. Someone’s just trying to make a quick buck. https://www.ebay.com/itm/155238303362

I only encountered 4 motherboards with IBM PC 5150 Rev.0 (04/24/81), but two of them had BIOS and motherboards that were completely broken and could not be repaired. (The two bad BIOSes were discarded a long time ago, and the two main boards were also requested to be repaired by someone they...

Well, I also have full package of it, but I have no way to scan Quick Reference Card. as PDF. I recomment to buy it from eBay if you're in the U.S. or Canada. https://www.ebay.com/itm/293017188788 https://www.ebay.com/itm/293017188776 https://www.ebay.com/itm/303103845998...

If the serial number was close to what I was looking for, I could have bought it quickly, but as soon as I checked the number, I gave up on the instant ball. This is because you already have a motherboard with a lower number than that serial number.

Upgrading to Rev.2 BIOS is out of the question here, the important thing is that I used Rev.0 / Rev.1 BIOS and set the RAM up to 544KB in SW2. However, when I run it while setting it to recognize up to 640KB in MicroRAM, it is definitely correct to recognize up to 544KB in MS-DOS. But why did...